/*
 * Copyright (C) 2008, Florian Köberle <florianskarten@web.de>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Git Development Community nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package ch.cyberduck.core.sftp.openssh.config.fnmatch;

import java.util.List;

abstract class AbstractHead implements Head {
    private List<Head> newHeads = null;

    private final boolean star;

    protected abstract boolean matches(char c);

    AbstractHead(boolean star) {
        this.star = star;
    }

    /**
     * @param newHeads a list of {@link Head}s which will not be modified.
     */
    public final void setNewHeads(List<Head> newHeads) {
        if(this.newHeads != null) {
            throw new IllegalStateException("Property is already non null");
        }
        this.newHeads = newHeads;
    }

    @Override
    public List<Head> getNextHeads(char c) {
        if(matches(c)) {
            return newHeads;
        }
        else {
            return FileNameMatcher.EMPTY_HEAD_LIST;
        }
    }

    boolean isStar() {
        return star;
    }
}
